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Microphone array with daisy-chain summation

A technology of microphones and microphone signals, applied in the field of microphones, can solve problems such as failures or problems rising, affecting the overall reliability of the system, etc.

Active Publication Date: 2013-05-15
ANALOG DEVICES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Introducing these additional wires requires additional cost and equipment space
Additionally, additional wires can affect the overall reliability of the system, as the likelihood of a defect, failure, or problem with one or more groups of wires tends to rise with the number of wires

Method used

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  • Microphone array with daisy-chain summation
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  • Microphone array with daisy-chain summation

Examples

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Embodiment Construction

[0024] Embodiments of the present invention provide a system with an array of microphone stages, where each microphone stage can be daisy-chain coupled together. Each microphone stage may include a microphone, an analog-to-digital converter, a decimation unit, a receiver, an adder, and a transmitter. An analog-to-digital converter converts sampled audio signals from a microphone into digital code. The decimation unit may decimate the digital code from the output of the analog-to-digital converter to the audio frame rate of the serial interface used to send the data between the microphone stages. The decimation unit may also include a delay unit to achieve delay at each microphone stage.

[0025] A transmitter in a first microphone stage may send the output of the decimation unit to a receiver in a second microphone stage in the array. An adder in the second microphone stage may add the digital code sent from the first stage to the output of the decimation unit in the second ...

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PUM

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Abstract

The invention provides a microphone array with daisy-chain summation. Microphone stages in a microphone array may be coupled together in a daisy chain. Each stage may include a microphone, an analog to digital converter, a decimation unit, a receiver, an adder, and a transmitter. The converter may convert analog audio microphone signals into digital codes that may be decimated. The adder may add decimated digital codes in each stage to a cumulative sum of decimated digital codes from prior stages. This new sum may be transmitted to the next microphone stage, where the adder may add the decimated digital codes from that stage to the cumulative sum. A serial interface may be used to connect the transmitters and receivers of each of the stages. The serial interface may be used to transmit the cumulative sum of decimated digital codes between the stages. The serial interface may also be used to transmit configuration data between the stages.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Patent Application No. 61 / 559,435, filed November 14, 2011, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates generally to microphones, and more particularly to microphone arrays with daisy-chain summation. Background technique [0004] Microphone arrays have been used to improve fidelity and reduce the effects of ambient noise. An array of two or more microphones can be used to capture a specific audio signal while reducing the effects of background noise and other undesired sounds. Various beamforming algorithms can be used to combine the signals from each microphone in the array so that audio signals originating from certain directions interfere constructively and produce the greatest response compared to audio signals originating from other directions. [0005] These beamforming algorithms...

Claims

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Application Information

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IPC IPC(8): H04R3/00H04R1/08
CPCH04R1/08H04R3/00H04R3/005H04R2499/13
Inventor R·阿达姆斯D·霍萨克B·维格达E·内斯特勒M·威尔齐克
Owner ANALOG DEVICES INC